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1	VERSION = 2
2	PATCHLEVEL = 6
3	SUBLEVEL = 39
4	EXTRAVERSION =
5	NAME = Flesh-Eating Bats with Fangs
6
7	# DOCUMENTATION
8	# To see a list of typical targets execute "make help"
9	# More info can be located in ./README
10	# Comments in this file are targeted only to the developer, do not
11	# expect to learn how to build the kernel reading this file.
12
13	# Do not:
14	# o use make's built-in rules and variables
15	# (this increases performance and avoids hard-to-debug behaviour);
16	# o print "Entering directory ...";
17	MAKEFLAGS += -rR --no-print-directory
18
19	# Avoid funny character set dependencies
20	unexport LC_ALL
21	LC_COLLATE=C
22	LC_NUMERIC=C
23	export LC_COLLATE LC_NUMERIC
24
25	# We are using a recursive build, so we need to do a little thinking
26	# to get the ordering right.
27	#
28	# Most importantly: sub-Makefiles should only ever modify files in
29	# their own directory. If in some directory we have a dependency on
30	# a file in another dir (which doesn't happen often, but it's often
31	# unavoidable when linking the built-in.o targets which finally
32	# turn into vmlinux), we will call a sub make in that other dir, and
33	# after that we are sure that everything which is in that other dir
34	# is now up to date.
35	#
36	# The only cases where we need to modify files which have global
37	# effects are thus separated out and done before the recursive
38	# descending is started. They are now explicitly listed as the
39	# prepare rule.
40
41	# To put more focus on warnings, be less verbose as default
42	# Use 'make V=1' to see the full commands
43
44	ifeq ("$(origin V)", "command line")
45	KBUILD_VERBOSE = $(V)
46	endif
47	ifndef KBUILD_VERBOSE
48	KBUILD_VERBOSE = 0
49	endif
50
51	# Call a source code checker (by default, "sparse") as part of the
52	# C compilation.
53	#
54	# Use 'make C=1' to enable checking of only re-compiled files.
55	# Use 'make C=2' to enable checking of all source files, regardless
56	# of whether they are re-compiled or not.
57	#
58	# See the file "Documentation/sparse.txt" for more details, including
59	# where to get the "sparse" utility.
60
61	ifeq ("$(origin C)", "command line")
62	KBUILD_CHECKSRC = $(C)
63	endif
64	ifndef KBUILD_CHECKSRC
65	KBUILD_CHECKSRC = 0
66	endif
67
68	# Use make M=dir to specify directory of external module to build
69	# Old syntax make ... SUBDIRS=$PWD is still supported
70	# Setting the environment variable KBUILD_EXTMOD take precedence
71	ifdef SUBDIRS
72	KBUILD_EXTMOD ?= $(SUBDIRS)
73	endif
74
75	ifeq ("$(origin M)", "command line")
76	KBUILD_EXTMOD := $(M)
77	endif
78
79	# kbuild supports saving output files in a separate directory.
80	# To locate output files in a separate directory two syntaxes are supported.
81	# In both cases the working directory must be the root of the kernel src.
82	# 1) O=
83	# Use "make O=dir/to/store/output/files/"
84	#
85	# 2) Set KBUILD_OUTPUT
86	# Set the environment variable KBUILD_OUTPUT to point to the directory
87	# where the output files shall be placed.
88	# export KBUILD_OUTPUT=dir/to/store/output/files/
89	# make
90	#
91	# The O= assignment takes precedence over the KBUILD_OUTPUT environment
92	# variable.
93
94
95	# KBUILD_SRC is set on invocation of make in OBJ directory
96	# KBUILD_SRC is not intended to be used by the regular user (for now)
97	ifeq ($(KBUILD_SRC),)
98
99	# OK, Make called in directory where kernel src resides
100	# Do we want to locate output files in a separate directory?
101	ifeq ("$(origin O)", "command line")
102	KBUILD_OUTPUT := $(O)
103	endif
104
105	ifeq ("$(origin W)", "command line")
106	export KBUILD_ENABLE_EXTRA_GCC_CHECKS := 1
107	endif
108
109	# That's our default target when none is given on the command line
110	PHONY := _all
111	_all:
112
113	# Cancel implicit rules on top Makefile
114	$(CURDIR)/Makefile Makefile: ;
115
116	ifneq ($(KBUILD_OUTPUT),)
117	# Invoke a second make in the output directory, passing relevant variables
118	# check that the output directory actually exists
119	saved-output := $(KBUILD_OUTPUT)
120	KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
121	$(if $(KBUILD_OUTPUT),, \
122	$(error output directory "$(saved-output)" does not exist))
123
124	PHONY += $(MAKECMDGOALS) sub-make
125
126	$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
127	$(Q)@:
128
129	sub-make: FORCE
130	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
131	KBUILD_SRC=$(CURDIR) \
132	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
133	$(filter-out _all sub-make,$(MAKECMDGOALS))
134
135	# Leave processing to above invocation of make
136	skip-makefile := 1
137	endif # ifneq ($(KBUILD_OUTPUT),)
138	endif # ifeq ($(KBUILD_SRC),)
139
140	# We process the rest of the Makefile if this is the final invocation of make
141	ifeq ($(skip-makefile),)
142
143	# If building an external module we do not care about the all: rule
144	# but instead _all depend on modules
145	PHONY += all
146	ifeq ($(KBUILD_EXTMOD),)
147	_all: all
148	else
149	_all: modules
150	endif
151
152	srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
153	objtree := $(CURDIR)
154	src := $(srctree)
155	obj := $(objtree)
156
157	VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
158
159	export srctree objtree VPATH
160
161
162	# SUBARCH tells the usermode build what the underlying arch is. That is set
163	# first, and if a usermode build is happening, the "ARCH=um" on the command
164	# line overrides the setting of ARCH below. If a native build is happening,
165	# then ARCH is assigned, getting whatever value it gets normally, and
166	# SUBARCH is subsequently ignored.
167
168	SUBARCH := $(shell uname -m \| sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169	-e s/arm.*/arm/ -e s/sa110/arm/ \
170	-e s/s390x/s390/ -e s/parisc64/parisc/ \
171	-e s/ppc./powerpc/ -e s/mips./mips/ \
172	-e s/sh[234].*/sh/ )
173
174	# Cross compiling and selecting different set of gcc/bin-utils
175	# ---------------------------------------------------------------------------
176	#
177	# When performing cross compilation for other architectures ARCH shall be set
178	# to the target architecture. (See arch/* for the possibilities).
179	# ARCH can be set during invocation of make:
180	# make ARCH=ia64
181	# Another way is to have ARCH set in the environment.
182	# The default ARCH is the host where make is executed.
183
184	# CROSS_COMPILE specify the prefix used for all executables used
185	# during compilation. Only gcc and related bin-utils executables
186	# are prefixed with $(CROSS_COMPILE).
187	# CROSS_COMPILE can be set on the command line
188	# make CROSS_COMPILE=ia64-linux-
189	# Alternatively CROSS_COMPILE can be set in the environment.
190	# A third alternative is to store a setting in .config so that plain
191	# "make" in the configured kernel build directory always uses that.
192	# Default value for CROSS_COMPILE is not to prefix executables
193	# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
194	export KBUILD_BUILDHOST := $(SUBARCH)
195	ARCH ?= $(SUBARCH)
196	CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
197
198	# Architecture as present in compile.h
199	UTS_MACHINE := $(ARCH)
200	SRCARCH := $(ARCH)
201
202	# Additional ARCH settings for x86
203	ifeq ($(ARCH),i386)
204	SRCARCH := x86
205	endif
206	ifeq ($(ARCH),x86_64)
207	SRCARCH := x86
208	endif
209
210	# Additional ARCH settings for sparc
211	ifeq ($(ARCH),sparc32)
212	SRCARCH := sparc
213	endif
214	ifeq ($(ARCH),sparc64)
215	SRCARCH := sparc
216	endif
217
218	# Additional ARCH settings for sh
219	ifeq ($(ARCH),sh64)
220	SRCARCH := sh
221	endif
222
223	# Where to locate arch specific headers
224	hdr-arch := $(SRCARCH)
225
226	ifeq ($(ARCH),m68knommu)
227	hdr-arch := m68k
228	endif
229
230	KCONFIG_CONFIG ?= .config
231	export KCONFIG_CONFIG
232
233	# SHELL used by kbuild
234	CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
235	else if [ -x /bin/bash ]; then echo /bin/bash; \
236	else echo sh; fi ; fi)
237
238	HOSTCC = gcc
239	HOSTCXX = g++
240	HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
241	HOSTCXXFLAGS = -O2
242
243	# Decide whether to build built-in, modular, or both.
244	# Normally, just do built-in.
245
246	KBUILD_MODULES :=
247	KBUILD_BUILTIN := 1
248
249	# If we have only "make modules", don't compile built-in objects.
250	# When we're building modules with modversions, we need to consider
251	# the built-in objects during the descend as well, in order to
252	# make sure the checksums are up to date before we record them.
253
254	ifeq ($(MAKECMDGOALS),modules)
255	KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
256	endif
257
258	# If we have "make <whatever> modules", compile modules
259	# in addition to whatever we do anyway.
260	# Just "make" or "make all" shall build modules as well
261
262	ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
263	KBUILD_MODULES := 1
264	endif
265
266	ifeq ($(MAKECMDGOALS),)
267	KBUILD_MODULES := 1
268	endif
269
270	export KBUILD_MODULES KBUILD_BUILTIN
271	export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
272
273	# Beautify output
274	# ---------------------------------------------------------------------------
275	#
276	# Normally, we echo the whole command before executing it. By making
277	# that echo $($(quiet)$(cmd)), we now have the possibility to set
278	# $(quiet) to choose other forms of output instead, e.g.
279	#
280	# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
281	# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
282	#
283	# If $(quiet) is empty, the whole command will be printed.
284	# If it is set to "quiet_", only the short version will be printed.
285	# If it is set to "silent_", nothing will be printed at all, since
286	# the variable $(silent_cmd_cc_o_c) doesn't exist.
287	#
288	# A simple variant is to prefix commands with $(Q) - that's useful
289	# for commands that shall be hidden in non-verbose mode.
290	#
291	# $(Q)ln $@ :<
292	#
293	# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
294	# If KBUILD_VERBOSE equals 1 then the above command is displayed.
295
296	ifeq ($(KBUILD_VERBOSE),1)
297	quiet =
298	Q =
299	else
300	quiet=quiet_
301	Q = @
302	endif
303
304	# If the user is running make -s (silent mode), suppress echoing of
305	# commands
306
307	ifneq ($(findstring s,$(MAKEFLAGS)),)
308	quiet=silent_
309	endif
310
311	export quiet Q KBUILD_VERBOSE
312
313
314	# Look for make include files relative to root of kernel src
315	MAKEFLAGS += --include-dir=$(srctree)
316
317	# We need some generic definitions (do not try to remake the file).
318	$(srctree)/scripts/Kbuild.include: ;
319	include $(srctree)/scripts/Kbuild.include
320
321	# Make variables (CC, etc...)
322
323	AS = $(CROSS_COMPILE)as
324	LD = $(CROSS_COMPILE)ld
325	CC = $(CROSS_COMPILE)gcc
326	CPP = $(CC) -E
327	AR = $(CROSS_COMPILE)ar
328	NM = $(CROSS_COMPILE)nm
329	STRIP = $(CROSS_COMPILE)strip
330	OBJCOPY = $(CROSS_COMPILE)objcopy
331	OBJDUMP = $(CROSS_COMPILE)objdump
332	AWK = awk
333	GENKSYMS = scripts/genksyms/genksyms
334	INSTALLKERNEL := installkernel
335	DEPMOD = /sbin/depmod
336	KALLSYMS = scripts/kallsyms
337	PERL = perl
338	CHECK = sparse
339
340	CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
341	-Wbitwise -Wno-return-void $(CF)
342	CFLAGS_MODULE =
343	AFLAGS_MODULE =
344	LDFLAGS_MODULE =
345	CFLAGS_KERNEL =
346	AFLAGS_KERNEL =
347	CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
348
349
350	# Use LINUXINCLUDE when you must reference the include/ directory.
351	# Needed to be compatible with the O= option
352	LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
353	$(if $(KBUILD_SRC), -I$(srctree)/include) \
354	-include include/generated/autoconf.h
355
356	KBUILD_CPPFLAGS := -D__KERNEL__
357
358	KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
359	-fno-strict-aliasing -fno-common \
360	-Werror-implicit-function-declaration \
361	-Wno-format-security \
362	-fno-delete-null-pointer-checks
363	KBUILD_AFLAGS_KERNEL :=
364	KBUILD_CFLAGS_KERNEL :=
365	KBUILD_AFLAGS := -D__ASSEMBLY__
366	KBUILD_AFLAGS_MODULE := -DMODULE
367	KBUILD_CFLAGS_MODULE := -DMODULE
368	KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
369
370	# Read KERNELRELEASE from include/config/kernel.release (if it exists)
371	KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
372	KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
373
374	export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
375	export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
376	export CPP AR NM STRIP OBJCOPY OBJDUMP
377	export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
378	export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
379
380	export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
381	export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
382	export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
383	export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
384	export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
385
386	# When compiling out-of-tree modules, put MODVERDIR in the module
387	# tree rather than in the kernel tree. The kernel tree might
388	# even be read-only.
389	export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
390
391	# Files to ignore in find ... statements
392
393	RCS_FIND_IGNORE := $ -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git $ -prune -o
394	export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
395
396	# ===========================================================================
397	# Rules shared between *config targets and build targets
398
399	# Basic helpers built in scripts/
400	PHONY += scripts_basic
401	scripts_basic:
402	$(Q)$(MAKE) $(build)=scripts/basic
403	$(Q)rm -f .tmp_quiet_recordmcount
404
405	# To avoid any implicit rule to kick in, define an empty command.
406	scripts/basic/%: scripts_basic ;
407
408	PHONY += outputmakefile
409	# outputmakefile generates a Makefile in the output directory, if using a
410	# separate output directory. This allows convenient use of make in the
411	# output directory.
412	outputmakefile:
413	ifneq ($(KBUILD_SRC),)
414	$(Q)ln -fsn $(srctree) source
415	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
416	$(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
417	endif
418
419	# To make sure we do not include .config for any of the *config targets
420	# catch them early, and hand them over to scripts/kconfig/Makefile
421	# It is allowed to specify more targets when calling make, including
422	# mixing *config targets and build targets.
423	# For example 'make oldconfig all'.
424	# Detect when mixed targets is specified, and make a second invocation
425	# of make so .config is not included in this case either (for *config).
426
427	no-dot-config-targets := clean mrproper distclean \
428	cscope gtags TAGS tags help %docs check% coccicheck \
429	include/linux/version.h headers_% \
430	kernelversion %src-pkg
431
432	config-targets := 0
433	mixed-targets := 0
434	dot-config := 1
435
436	ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
437	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
438	dot-config := 0
439	endif
440	endif
441
442	ifeq ($(KBUILD_EXTMOD),)
443	ifneq ($(filter config %config,$(MAKECMDGOALS)),)
444	config-targets := 1
445	ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
446	mixed-targets := 1
447	endif
448	endif
449	endif
450
451	ifeq ($(mixed-targets),1)
452	# ===========================================================================
453	# We're called with mixed targets (*config and build targets).
454	# Handle them one by one.
455
456	%:: FORCE
457	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
458
459	else
460	ifeq ($(config-targets),1)
461	# ===========================================================================
462	# *config targets only - make sure prerequisites are updated, and descend
463	# in scripts/kconfig to make the *config target
464
465	# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
466	# KBUILD_DEFCONFIG may point out an alternative default configuration
467	# used for 'make defconfig'
468	include $(srctree)/arch/$(SRCARCH)/Makefile
469	export KBUILD_DEFCONFIG KBUILD_KCONFIG
470
471	config: scripts_basic outputmakefile FORCE
472	$(Q)mkdir -p include/linux include/config
473	$(Q)$(MAKE) $(build)=scripts/kconfig $@
474
475	%config: scripts_basic outputmakefile FORCE
476	$(Q)mkdir -p include/linux include/config
477	$(Q)$(MAKE) $(build)=scripts/kconfig $@
478
479	else
480	# ===========================================================================
481	# Build targets only - this includes vmlinux, arch specific targets, clean
482	# targets and others. In general all targets except *config targets.
483
484	ifeq ($(KBUILD_EXTMOD),)
485	# Additional helpers built in scripts/
486	# Carefully list dependencies so we do not try to build scripts twice
487	# in parallel
488	PHONY += scripts
489	scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
490	$(Q)$(MAKE) $(build)=$(@)
491
492	# Objects we will link into vmlinux / subdirs we need to visit
493	init-y := init/
494	drivers-y := drivers/ sound/ firmware/
495	net-y := net/
496	libs-y := lib/
497	core-y := usr/
498	endif # KBUILD_EXTMOD
499
500	ifeq ($(dot-config),1)
501	# Read in config
502	-include include/config/auto.conf
503
504	ifeq ($(KBUILD_EXTMOD),)
505	# Read in dependencies to all Kconfig* files, make sure to run
506	# oldconfig if changes are detected.
507	-include include/config/auto.conf.cmd
508
509	# To avoid any implicit rule to kick in, define an empty command
510	$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
511
512	# If .config is newer than include/config/auto.conf, someone tinkered
513	# with it and forgot to run make oldconfig.
514	# if auto.conf.cmd is missing then we are probably in a cleaned tree so
515	# we execute the config step to be sure to catch updated Kconfig files
516	include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
517	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
518	else
519	# external modules needs include/generated/autoconf.h and include/config/auto.conf
520	# but do not care if they are up-to-date. Use auto.conf to trigger the test
521	PHONY += include/config/auto.conf
522
523	include/config/auto.conf:
524	$(Q)test -e include/generated/autoconf.h -a -e $@ \|\| ( \
525	echo; \
526	echo " ERROR: Kernel configuration is invalid."; \
527	echo " include/generated/autoconf.h or $@ are missing.";\
528	echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
529	echo; \
530	/bin/false)
531
532	endif # KBUILD_EXTMOD
533
534	else
535	# Dummy target needed, because used as prerequisite
536	include/config/auto.conf: ;
537	endif # $(dot-config)
538
539	# The all: target is the default when no target is given on the
540	# command line.
541	# This allow a user to issue only 'make' to build a kernel including modules
542	# Defaults to vmlinux, but the arch makefile usually adds further targets
543	all: vmlinux
544
545	ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
546	KBUILD_CFLAGS += -Os
547	else
548	KBUILD_CFLAGS += -O2
549	endif
550
551	include $(srctree)/arch/$(SRCARCH)/Makefile
552
553	ifneq ($(CONFIG_FRAME_WARN),0)
554	KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
555	endif
556
557	# Force gcc to behave correct even for buggy distributions
558	ifndef CONFIG_CC_STACKPROTECTOR
559	KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
560	endif
561
562	ifdef CONFIG_FRAME_POINTER
563	KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
564	else
565	# Some targets (ARM with Thumb2, for example), can't be built with frame
566	# pointers. For those, we don't have FUNCTION_TRACER automatically
567	# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
568	# incompatible with -fomit-frame-pointer with current GCC, so we don't use
569	# -fomit-frame-pointer with FUNCTION_TRACER.
570	ifndef CONFIG_FUNCTION_TRACER
571	KBUILD_CFLAGS += -fomit-frame-pointer
572	endif
573	endif
574
575	ifdef CONFIG_DEBUG_INFO
576	KBUILD_CFLAGS += -g
577	KBUILD_AFLAGS += -gdwarf-2
578	endif
579
580	ifdef CONFIG_DEBUG_INFO_REDUCED
581	KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
582	endif
583
584	ifdef CONFIG_FUNCTION_TRACER
585	KBUILD_CFLAGS += -pg
586	ifdef CONFIG_DYNAMIC_FTRACE
587	ifdef CONFIG_HAVE_C_RECORDMCOUNT
588	BUILD_C_RECORDMCOUNT := y
589	export BUILD_C_RECORDMCOUNT
590	endif
591	endif
592	endif
593
594	# We trigger additional mismatches with less inlining
595	ifdef CONFIG_DEBUG_SECTION_MISMATCH
596	KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
597	endif
598
599	# arch Makefile may override CC so keep this after arch Makefile is included
600	NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
601	CHECKFLAGS += $(NOSTDINC_FLAGS)
602
603	# warn about C99 declaration after statement
604	KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
605
606	# disable pointer signed / unsigned warnings in gcc 4.0
607	KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
608
609	# disable invalid "can't wrap" optimizations for signed / pointers
610	KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
611
612	# conserve stack if available
613	KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
614
615	# check for 'asm goto'
616	ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
617	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
618	endif
619
620	# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
621	# But warn user when we do so
622	warn-assign = \
623	$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
624
625	ifneq ($(KCPPFLAGS),)
626	$(call warn-assign,CPPFLAGS)
627	KBUILD_CPPFLAGS += $(KCPPFLAGS)
628	endif
629	ifneq ($(KAFLAGS),)
630	$(call warn-assign,AFLAGS)
631	KBUILD_AFLAGS += $(KAFLAGS)
632	endif
633	ifneq ($(KCFLAGS),)
634	$(call warn-assign,CFLAGS)
635	KBUILD_CFLAGS += $(KCFLAGS)
636	endif
637
638	# Use --build-id when available.
639	LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
640	$(call cc-ldoption, -Wl$(comma)--build-id,))
641	KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
642	LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
643
644	ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
645	LDFLAGS_vmlinux += $(call ld-option, -X,)
646	endif
647
648	# Default kernel image to build when no specific target is given.
649	# KBUILD_IMAGE may be overruled on the command line or
650	# set in the environment
651	# Also any assignments in arch/$(ARCH)/Makefile take precedence over
652	# this default value
653	export KBUILD_IMAGE ?= vmlinux
654
655	#
656	# INSTALL_PATH specifies where to place the updated kernel and system map
657	# images. Default is /boot, but you can set it to other values
658	export INSTALL_PATH ?= /boot
659
660	#
661	# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
662	# relocations required by build roots. This is not defined in the
663	# makefile but the argument can be passed to make if needed.
664	#
665
666	MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
667	export MODLIB
668
669	#
670	# INSTALL_MOD_STRIP, if defined, will cause modules to be
671	# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
672	# the default option --strip-debug will be used. Otherwise,
673	# INSTALL_MOD_STRIP value will be used as the options to the strip command.
674
675	ifdef INSTALL_MOD_STRIP
676	ifeq ($(INSTALL_MOD_STRIP),1)
677	mod_strip_cmd = $(STRIP) --strip-debug
678	else
679	mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
680	endif # INSTALL_MOD_STRIP=1
681	else
682	mod_strip_cmd = true
683	endif # INSTALL_MOD_STRIP
684	export mod_strip_cmd
685
686
687	ifeq ($(KBUILD_EXTMOD),)
688	core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
689
690	vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
691	$(core-y) $(core-m) $(drivers-y) $(drivers-m) \
692	$(net-y) $(net-m) $(libs-y) $(libs-m)))
693
694	vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
695	$(init-n) $(init-) \
696	$(core-n) $(core-) $(drivers-n) $(drivers-) \
697	$(net-n) $(net-) $(libs-n) $(libs-))))
698
699	init-y := $(patsubst %/, %/built-in.o, $(init-y))
700	core-y := $(patsubst %/, %/built-in.o, $(core-y))
701	drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
702	net-y := $(patsubst %/, %/built-in.o, $(net-y))
703	libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
704	libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
705	libs-y := $(libs-y1) $(libs-y2)
706
707	# Build vmlinux
708	# ---------------------------------------------------------------------------
709	# vmlinux is built from the objects selected by $(vmlinux-init) and
710	# $(vmlinux-main). Most are built-in.o files from top-level directories
711	# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
712	# Ordering when linking is important, and $(vmlinux-init) must be first.
713	#
714	# vmlinux
715	# ^
716	# \|
717	# +-< $(vmlinux-init)
718	# \| +--< init/version.o + more
719	# \|
720	# +--< $(vmlinux-main)
721	# \| +--< driver/built-in.o mm/built-in.o + more
722	# \|
723	# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
724	#
725	# vmlinux version (uname -v) cannot be updated during normal
726	# descending-into-subdirs phase since we do not yet know if we need to
727	# update vmlinux.
728	# Therefore this step is delayed until just before final link of vmlinux -
729	# except in the kallsyms case where it is done just before adding the
730	# symbols to the kernel.
731	#
732	# System.map is generated to document addresses of all kernel symbols
733
734	vmlinux-init := $(head-y) $(init-y)
735	vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
736	vmlinux-all := $(vmlinux-init) $(vmlinux-main)
737	vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
738	export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
739
740	# Rule to link vmlinux - also used during CONFIG_KALLSYMS
741	# May be overridden by arch/$(ARCH)/Makefile
742	quiet_cmd_vmlinux__ ?= LD $@
743	cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
744	-T $(vmlinux-lds) $(vmlinux-init) \
745	--start-group $(vmlinux-main) --end-group \
746	$(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
747
748	# Generate new vmlinux version
749	quiet_cmd_vmlinux_version = GEN .version
750	cmd_vmlinux_version = set -e; \
751	if [ ! -r .version ]; then \
752	rm -f .version; \
753	echo 1 >.version; \
754	else \
755	mv .version .old_version; \
756	expr 0$$(cat .old_version) + 1 >.version; \
757	fi; \
758	$(MAKE) $(build)=init
759
760	# Generate System.map
761	quiet_cmd_sysmap = SYSMAP
762	cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
763
764	# Link of vmlinux
765	# If CONFIG_KALLSYMS is set .version is already updated
766	# Generate System.map and verify that the content is consistent
767	# Use + in front of the vmlinux_version rule to silent warning with make -j2
768	# First command is ':' to allow us to use + in front of the rule
769	define rule_vmlinux__
770	:
771	$(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
772
773	$(call cmd,vmlinux__)
774	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
775
776	$(Q)$(if $($(quiet)cmd_sysmap), \
777	echo ' $($(quiet)cmd_sysmap) System.map' &&) \
778	$(cmd_sysmap) $@ System.map; \
779	if [ $$? -ne 0 ]; then \
780	rm -f $@; \
781	/bin/false; \
782	fi;
783	$(verify_kallsyms)
784	endef
785
786
787	ifdef CONFIG_KALLSYMS
788	# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
789	# It's a three stage process:
790	# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
791	# empty
792	# Running kallsyms on that gives us .tmp_kallsyms1.o with
793	# the right size - vmlinux version (uname -v) is updated during this step
794	# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
795	# but due to the added section, some addresses have shifted.
796	# From here, we generate a correct .tmp_kallsyms2.o
797	# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
798	# o Verify that the System.map from vmlinux matches the map from
799	# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
800	# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
801	# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
802	# temporary bypass to allow the kernel to be built while the
803	# maintainers work out what went wrong with kallsyms.
804
805	ifdef CONFIG_KALLSYMS_EXTRA_PASS
806	last_kallsyms := 3
807	else
808	last_kallsyms := 2
809	endif
810
811	kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
812
813	define verify_kallsyms
814	$(Q)$(if $($(quiet)cmd_sysmap), \
815	echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
816	$(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
817	$(Q)cmp -s System.map .tmp_System.map \|\| \
818	(echo Inconsistent kallsyms data; \
819	echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
820	rm .tmp_kallsyms* ; /bin/false )
821	endef
822
823	# Update vmlinux version before link
824	# Use + in front of this rule to silent warning about make -j1
825	# First command is ':' to allow us to use + in front of this rule
826	cmd_ksym_ld = $(cmd_vmlinux__)
827	define rule_ksym_ld
828	:
829	+$(call cmd,vmlinux_version)
830	$(call cmd,vmlinux__)
831	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
832	endef
833
834	# Generate .S file with all kernel symbols
835	quiet_cmd_kallsyms = KSYM $@
836	cmd_kallsyms = $(NM) -n $< \| $(KALLSYMS) \
837	$(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
838
839	.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
840	$(call if_changed_dep,as_o_S)
841
842	.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
843	$(call cmd,kallsyms)
844
845	# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
846	.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
847	$(call if_changed_rule,ksym_ld)
848
849	.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
850	$(call if_changed,vmlinux__)
851
852	.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
853	$(call if_changed,vmlinux__)
854
855	# Needs to visit scripts/ before $(KALLSYMS) can be used.
856	$(KALLSYMS): scripts ;
857
858	# Generate some data for debugging strange kallsyms problems
859	debug_kallsyms: .tmp_map$(last_kallsyms)
860
861	.tmp_map%: .tmp_vmlinux% FORCE
862	($(OBJDUMP) -h $< \| $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) \| sort > $@
863
864	.tmp_map3: .tmp_map2
865
866	.tmp_map2: .tmp_map1
867
868	endif # ifdef CONFIG_KALLSYMS
869
870	# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
871	# relevant sections renamed as per the linker script.
872	quiet_cmd_vmlinux-modpost = LD $@
873	cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
874	$(vmlinux-init) --start-group $(vmlinux-main) --end-group \
875	$(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
876	define rule_vmlinux-modpost
877	:
878	+$(call cmd,vmlinux-modpost)
879	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
880	$(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
881	endef
882
883	# vmlinux image - including updated kernel symbols
884	vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
885	ifdef CONFIG_HEADERS_CHECK
886	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
887	endif
888	ifdef CONFIG_SAMPLES
889	$(Q)$(MAKE) $(build)=samples
890	endif
891	ifdef CONFIG_BUILD_DOCSRC
892	$(Q)$(MAKE) $(build)=Documentation
893	endif
894	$(call vmlinux-modpost)
895	$(call if_changed_rule,vmlinux__)
896	$(Q)rm -f .old_version
897
898	# build vmlinux.o first to catch section mismatch errors early
899	ifdef CONFIG_KALLSYMS
900	.tmp_vmlinux1: vmlinux.o
901	endif
902
903	modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
904	vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
905	$(call if_changed_rule,vmlinux-modpost)
906
907	# The actual objects are generated when descending,
908	# make sure no implicit rule kicks in
909	$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
910
911	# Handle descending into subdirectories listed in $(vmlinux-dirs)
912	# Preset locale variables to speed up the build process. Limit locale
913	# tweaks to this spot to avoid wrong language settings when running
914	# make menuconfig etc.
915	# Error messages still appears in the original language
916
917	PHONY += $(vmlinux-dirs)
918	$(vmlinux-dirs): prepare scripts
919	$(Q)$(MAKE) $(build)=$@
920
921	# Store (new) KERNELRELASE string in include/config/kernel.release
922	include/config/kernel.release: include/config/auto.conf FORCE
923	$(Q)rm -f $@
924	$(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
925
926
927	# Things we need to do before we recursively start building the kernel
928	# or the modules are listed in "prepare".
929	# A multi level approach is used. prepareN is processed before prepareN-1.
930	# archprepare is used in arch Makefiles and when processed asm symlink,
931	# version.h and scripts_basic is processed / created.
932
933	# Listed in dependency order
934	PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
935
936	# prepare3 is used to check if we are building in a separate output directory,
937	# and if so do:
938	# 1) Check that make has not been executed in the kernel src $(srctree)
939	prepare3: include/config/kernel.release
940	ifneq ($(KBUILD_SRC),)
941	@$(kecho) ' Using $(srctree) as source for kernel'
942	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
943	echo " $(srctree) is not clean, please run 'make mrproper'";\
944	echo " in the '$(srctree)' directory.";\
945	/bin/false; \
946	fi;
947	endif
948
949	# prepare2 creates a makefile if using a separate output directory
950	prepare2: prepare3 outputmakefile
951
952	prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
953	include/config/auto.conf
954	$(cmd_crmodverdir)
955
956	archprepare: prepare1 scripts_basic
957
958	prepare0: archprepare FORCE
959	$(Q)$(MAKE) $(build)=.
960	$(Q)$(MAKE) $(build)=. missing-syscalls
961
962	# All the preparing..
963	prepare: prepare0
964
965	# Generate some files
966	# ---------------------------------------------------------------------------
967
968	# KERNELRELEASE can change from a few different places, meaning version.h
969	# needs to be updated, so this check is forced on all builds
970
971	uts_len := 64
972	define filechk_utsrelease.h
973	if [ `echo -n "$(KERNELRELEASE)" \| wc -c ` -gt $(uts_len) ]; then \
974	echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
975	exit 1; \
976	fi; \
977	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
978	endef
979
980	define filechk_version.h
981	(echo \#define LINUX_VERSION_CODE $(shell \
982	expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
983	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
984	endef
985
986	include/linux/version.h: $(srctree)/Makefile FORCE
987	$(call filechk,version.h)
988
989	include/generated/utsrelease.h: include/config/kernel.release FORCE
990	$(call filechk,utsrelease.h)
991
992	PHONY += headerdep
993	headerdep:
994	$(Q)find include/ -name '*.h' \| xargs --max-args 1 scripts/headerdep.pl
995
996	# ---------------------------------------------------------------------------
997
998	PHONY += depend dep
999	depend dep:
1000	@echo '*** Warning: make $@ is unnecessary now.'
1001
1002	# ---------------------------------------------------------------------------
1003	# Firmware install
1004	INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1005	export INSTALL_FW_PATH
1006
1007	PHONY += firmware_install
1008	firmware_install: FORCE
1009	@mkdir -p $(objtree)/firmware
1010	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1011
1012	# ---------------------------------------------------------------------------
1013	# Kernel headers
1014
1015	#Default location for installed headers
1016	export INSTALL_HDR_PATH = $(objtree)/usr
1017
1018	hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1019
1020	# If we do an all arch process set dst to asm-$(hdr-arch)
1021	hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1022
1023	PHONY += __headers
1024	__headers: include/linux/version.h scripts_basic FORCE
1025	$(Q)$(MAKE) $(build)=scripts build_unifdef
1026
1027	PHONY += headers_install_all
1028	headers_install_all:
1029	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1030
1031	PHONY += headers_install
1032	headers_install: __headers
1033	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1034	$(error Headers not exportable for the $(SRCARCH) architecture))
1035	$(Q)$(MAKE) $(hdr-inst)=include
1036	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1037
1038	PHONY += headers_check_all
1039	headers_check_all: headers_install_all
1040	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1041
1042	PHONY += headers_check
1043	headers_check: headers_install
1044	$(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1045	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1046
1047	# ---------------------------------------------------------------------------
1048	# Modules
1049
1050	ifdef CONFIG_MODULES
1051
1052	# By default, build modules as well
1053
1054	all: modules
1055
1056	# Build modules
1057	#
1058	# A module can be listed more than once in obj-m resulting in
1059	# duplicate lines in modules.order files. Those are removed
1060	# using awk while concatenating to the final file.
1061
1062	PHONY += modules
1063	modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1064	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1065	@$(kecho) ' Building modules, stage 2.';
1066	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1067	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1068
1069	modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1070	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1071
1072	%/modules.builtin: include/config/auto.conf
1073	$(Q)$(MAKE) $(modbuiltin)=$*
1074
1075
1076	# Target to prepare building external modules
1077	PHONY += modules_prepare
1078	modules_prepare: prepare scripts
1079
1080	# Target to install modules
1081	PHONY += modules_install
1082	modules_install: _modinst_ _modinst_post
1083
1084	PHONY += _modinst_
1085	_modinst_:
1086	@if [ -z "`$(DEPMOD) -V 2>/dev/null \| grep module-init-tools`" ]; then \
1087	echo "Warning: you may need to install module-init-tools"; \
1088	echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1089	sleep 1; \
1090	fi
1091	@rm -rf $(MODLIB)/kernel
1092	@rm -f $(MODLIB)/source
1093	@mkdir -p $(MODLIB)/kernel
1094	@ln -s $(srctree) $(MODLIB)/source
1095	@if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1096	rm -f $(MODLIB)/build ; \
1097	ln -s $(objtree) $(MODLIB)/build ; \
1098	fi
1099	@cp -f $(objtree)/modules.order $(MODLIB)/
1100	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1101	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1102
1103	# This depmod is only for convenience to give the initial
1104	# boot a modules.dep even before / is mounted read-write. However the
1105	# boot script depmod is the master version.
1106	PHONY += _modinst_post
1107	_modinst_post: _modinst_
1108	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1109	$(call cmd,depmod)
1110
1111	else # CONFIG_MODULES
1112
1113	# Modules not configured
1114	# ---------------------------------------------------------------------------
1115
1116	modules modules_install: FORCE
1117	@echo
1118	@echo "The present kernel configuration has modules disabled."
1119	@echo "Type 'make config' and enable loadable module support."
1120	@echo "Then build a kernel with module support enabled."
1121	@echo
1122	@exit 1
1123
1124	endif # CONFIG_MODULES
1125
1126	###
1127	# Cleaning is done on three levels.
1128	# make clean Delete most generated files
1129	# Leave enough to build external modules
1130	# make mrproper Delete the current configuration, and all generated files
1131	# make distclean Remove editor backup files, patch leftover files and the like
1132
1133	# Directories & files removed with 'make clean'
1134	CLEAN_DIRS += $(MODVERDIR)
1135	CLEAN_FILES += vmlinux System.map \
1136	.tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1137
1138	# Directories & files removed with 'make mrproper'
1139	MRPROPER_DIRS += include/config usr/include include/generated
1140	MRPROPER_FILES += .config .config.old .version .old_version \
1141	include/linux/version.h \
1142	Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1143
1144	# clean - Delete most, but leave enough to build external modules
1145	#
1146	clean: rm-dirs := $(CLEAN_DIRS)
1147	clean: rm-files := $(CLEAN_FILES)
1148	clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1149
1150	PHONY += $(clean-dirs) clean archclean
1151	$(clean-dirs):
1152	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1153
1154	clean: archclean
1155
1156	# mrproper - Delete all generated files, including .config
1157	#
1158	mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1159	mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1160	mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1161
1162	PHONY += $(mrproper-dirs) mrproper archmrproper
1163	$(mrproper-dirs):
1164	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1165
1166	mrproper: clean archmrproper $(mrproper-dirs)
1167	$(call cmd,rmdirs)
1168	$(call cmd,rmfiles)
1169
1170	# distclean
1171	#
1172	PHONY += distclean
1173
1174	distclean: mrproper
1175	@find $(srctree) $(RCS_FIND_IGNORE) \
1176	\( -name '.orig' -o -name '.rej' -o -name '*~' \
1177	-o -name '.bak' -o -name '##' -o -name '.*.orig' \
1178	-o -name '.*.rej' -o -size 0 \
1179	-o -name '%' -o -name '..cmd' -o -name 'core' \) \
1180	-type f -print \| xargs rm -f
1181
1182
1183	# Packaging of the kernel to various formats
1184	# ---------------------------------------------------------------------------
1185	# rpm target kept for backward compatibility
1186	package-dir := $(srctree)/scripts/package
1187
1188	%src-pkg: FORCE
1189	$(Q)$(MAKE) $(build)=$(package-dir) $@
1190	%pkg: include/config/kernel.release FORCE
1191	$(Q)$(MAKE) $(build)=$(package-dir) $@
1192	rpm: include/config/kernel.release FORCE
1193	$(Q)$(MAKE) $(build)=$(package-dir) $@
1194
1195
1196	# Brief documentation of the typical targets used
1197	# ---------------------------------------------------------------------------
1198
1199	boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1200	boards := $(notdir $(boards))
1201	board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs//_defconfig))
1202	board-dirs := $(sort $(notdir $(board-dirs:/=)))
1203
1204	help:
1205	@echo 'Cleaning targets:'
1206	@echo ' clean - Remove most generated files but keep the config and'
1207	@echo ' enough build support to build external modules'
1208	@echo ' mrproper - Remove all generated files + config + various backup files'
1209	@echo ' distclean - mrproper + remove editor backup and patch files'
1210	@echo ''
1211	@echo 'Configuration targets:'
1212	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1213	@echo ''
1214	@echo 'Other generic targets:'
1215	@echo ' all - Build all targets marked with [*]'
1216	@echo '* vmlinux - Build the bare kernel'
1217	@echo '* modules - Build all modules'
1218	@echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1219	@echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1220	@echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1221	@echo ' dir/ - Build all files in dir and below'
1222	@echo ' dir/file.[oisS] - Build specified target only'
1223	@echo ' dir/file.lst - Build specified mixed source/assembly target only'
1224	@echo ' (requires a recent binutils and recent build (System.map))'
1225	@echo ' dir/file.ko - Build module including final link'
1226	@echo ' modules_prepare - Set up for building external modules'
1227	@echo ' tags/TAGS - Generate tags file for editors'
1228	@echo ' cscope - Generate cscope index'
1229	@echo ' gtags - Generate GNU GLOBAL index'
1230	@echo ' kernelrelease - Output the release version string'
1231	@echo ' kernelversion - Output the version stored in Makefile'
1232	@echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1233	echo ' (default: $(INSTALL_HDR_PATH))'; \
1234	echo ''
1235	@echo 'Static analysers'
1236	@echo ' checkstack - Generate a list of stack hogs'
1237	@echo ' namespacecheck - Name space analysis on compiled kernel'
1238	@echo ' versioncheck - Sanity check on version.h usage'
1239	@echo ' includecheck - Check for duplicate included header files'
1240	@echo ' export_report - List the usages of all exported symbols'
1241	@echo ' headers_check - Sanity check on exported headers'
1242	@echo ' headerdep - Detect inclusion cycles in headers'
1243	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1244	@echo ''
1245	@echo 'Kernel packaging:'
1246	@$(MAKE) $(build)=$(package-dir) help
1247	@echo ''
1248	@echo 'Documentation targets:'
1249	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1250	@echo ''
1251	@echo 'Architecture specific targets ($(SRCARCH)):'
1252	@$(if $(archhelp),$(archhelp),\
1253	echo ' No architecture specific help defined for $(SRCARCH)')
1254	@echo ''
1255	@$(if $(boards), \
1256	$(foreach b, $(boards), \
1257	printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1258	echo '')
1259	@$(if $(board-dirs), \
1260	$(foreach b, $(board-dirs), \
1261	printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1262	printf " %-16s - Show all of the above\\n" help-boards; \
1263	echo '')
1264
1265	@echo ' make V=0\|1 [targets] 0 => quiet build (default), 1 => verbose build'
1266	@echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1267	@echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1268	@echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1269	@echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1270	@echo ' make W=1 [targets] Enable extra gcc checks'
1271	@echo ''
1272	@echo 'Execute "make" or "make all" to build all targets marked with [*] '
1273	@echo 'For further info see the ./README file'
1274
1275
1276	help-board-dirs := $(addprefix help-,$(board-dirs))
1277
1278	help-boards: $(help-board-dirs)
1279
1280	boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$/_defconfig))
1281
1282	$(help-board-dirs): help-%:
1283	@echo 'Architecture specific targets ($(SRCARCH) $*):'
1284	@$(if $(boards-per-dir), \
1285	$(foreach b, $(boards-per-dir), \
1286	printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1287	echo '')
1288
1289
1290	# Documentation targets
1291	# ---------------------------------------------------------------------------
1292	%docs: scripts_basic FORCE
1293	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1294
1295	else # KBUILD_EXTMOD
1296
1297	###
1298	# External module support.
1299	# When building external modules the kernel used as basis is considered
1300	# read-only, and no consistency checks are made and the make
1301	# system is not used on the basis kernel. If updates are required
1302	# in the basis kernel ordinary make commands (without M=...) must
1303	# be used.
1304	#
1305	# The following are the only valid targets when building external
1306	# modules.
1307	# make M=dir clean Delete all automatically generated files
1308	# make M=dir modules Make all modules in specified dir
1309	# make M=dir Same as 'make M=dir modules'
1310	# make M=dir modules_install
1311	# Install the modules built in the module directory
1312	# Assumes install directory is already created
1313
1314	# We are always building modules
1315	KBUILD_MODULES := 1
1316	PHONY += crmodverdir
1317	crmodverdir:
1318	$(cmd_crmodverdir)
1319
1320	PHONY += $(objtree)/Module.symvers
1321	$(objtree)/Module.symvers:
1322	@test -e $(objtree)/Module.symvers \|\| ( \
1323	echo; \
1324	echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1325	echo " is missing; modules will have no dependencies and modversions."; \
1326	echo )
1327
1328	module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1329	PHONY += $(module-dirs) modules
1330	$(module-dirs): crmodverdir $(objtree)/Module.symvers
1331	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1332
1333	modules: $(module-dirs)
1334	@$(kecho) ' Building modules, stage 2.';
1335	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1336
1337	PHONY += modules_install
1338	modules_install: _emodinst_ _emodinst_post
1339
1340	install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1341	PHONY += _emodinst_
1342	_emodinst_:
1343	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1344	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1345
1346	PHONY += _emodinst_post
1347	_emodinst_post: _emodinst_
1348	$(call cmd,depmod)
1349
1350	clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1351
1352	PHONY += $(clean-dirs) clean
1353	$(clean-dirs):
1354	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1355
1356	clean: rm-dirs := $(MODVERDIR)
1357	clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1358
1359	help:
1360	@echo ' Building external modules.'
1361	@echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1362	@echo ''
1363	@echo ' modules - default target, build the module(s)'
1364	@echo ' modules_install - install the module'
1365	@echo ' clean - remove generated files in module directory only'
1366	@echo ''
1367
1368	# Dummies...
1369	PHONY += prepare scripts
1370	prepare: ;
1371	scripts: ;
1372	endif # KBUILD_EXTMOD
1373
1374	clean: $(clean-dirs)
1375	$(call cmd,rmdirs)
1376	$(call cmd,rmfiles)
1377	@find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1378	\( -name '.[oas]' -o -name '.ko' -o -name '.*.cmd' \
1379	-o -name '..d' -o -name '..tmp' -o -name '*.mod.c' \
1380	-o -name '*.symtypes' -o -name 'modules.order' \
1381	-o -name modules.builtin -o -name '.tmp_.o.' \
1382	-o -name '*.gcno' \) -type f -print \| xargs rm -f
1383
1384	# Generate tags for editors
1385	# ---------------------------------------------------------------------------
1386	quiet_cmd_tags = GEN $@
1387	cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1388
1389	tags TAGS cscope gtags: FORCE
1390	$(call cmd,tags)
1391
1392	# Scripts to check various things for consistency
1393	# ---------------------------------------------------------------------------
1394
1395	includecheck:
1396	find * $(RCS_FIND_IGNORE) \
1397	-name '*.[hcS]' -type f -print \| sort \
1398	\| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1399
1400	versioncheck:
1401	find * $(RCS_FIND_IGNORE) \
1402	-name '*.[hcS]' -type f -print \| sort \
1403	\| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1404
1405	coccicheck:
1406	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1407
1408	namespacecheck:
1409	$(PERL) $(srctree)/scripts/namespace.pl
1410
1411	export_report:
1412	$(PERL) $(srctree)/scripts/export_report.pl
1413
1414	endif #ifeq ($(config-targets),1)
1415	endif #ifeq ($(mixed-targets),1)
1416
1417	PHONY += checkstack kernelrelease kernelversion
1418
1419	# UML needs a little special treatment here. It wants to use the host
1420	# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1421	# else wants $(ARCH), including people doing cross-builds, which means
1422	# that $(SUBARCH) doesn't work here.
1423	ifeq ($(ARCH), um)
1424	CHECKSTACK_ARCH := $(SUBARCH)
1425	else
1426	CHECKSTACK_ARCH := $(ARCH)
1427	endif
1428	checkstack:
1429	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') \| \
1430	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1431
1432	kernelrelease:
1433	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1434
1435	kernelversion:
1436	@echo $(KERNELVERSION)
1437
1438	# Single targets
1439	# ---------------------------------------------------------------------------
1440	# Single targets are compatible with:
1441	# - build with mixed source and output
1442	# - build with separate output dir 'make O=...'
1443	# - external modules
1444	#
1445	# target-dir => where to store outputfile
1446	# build-dir => directory in kernel source tree to use
1447
1448	ifeq ($(KBUILD_EXTMOD),)
1449	build-dir = $(patsubst %/,%,$(dir $@))
1450	target-dir = $(dir $@)
1451	else
1452	zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1453	build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1454	target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1455	endif
1456
1457	%.s: %.c prepare scripts FORCE
1458	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1459	%.i: %.c prepare scripts FORCE
1460	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1461	%.o: %.c prepare scripts FORCE
1462	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1463	%.lst: %.c prepare scripts FORCE
1464	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1465	%.s: %.S prepare scripts FORCE
1466	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1467	%.o: %.S prepare scripts FORCE
1468	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1469	%.symtypes: %.c prepare scripts FORCE
1470	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1471
1472	# Modules
1473	/: prepare scripts FORCE
1474	$(cmd_crmodverdir)
1475	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1476	$(build)=$(build-dir)
1477	%/: prepare scripts FORCE
1478	$(cmd_crmodverdir)
1479	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1480	$(build)=$(build-dir)
1481	%.ko: prepare scripts FORCE
1482	$(cmd_crmodverdir)
1483	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1484	$(build)=$(build-dir) $(@:.ko=.o)
1485	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1486
1487	# FIXME Should go into a make.lib or something
1488	# ===========================================================================
1489
1490	quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1491	cmd_rmdirs = rm -rf $(rm-dirs)
1492
1493	quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1494	cmd_rmfiles = rm -f $(rm-files)
1495
1496	# Run depmod only if we have System.map and depmod is executable
1497	quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1498	cmd_depmod = \
1499	if [ -r System.map -a -x $(DEPMOD) ]; then \
1500	$(DEPMOD) -ae -F System.map \
1501	$(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1502	$(KERNELRELEASE); \
1503	fi
1504
1505	# Create temporary dir for module support files
1506	# clean it up only when building all modules
1507	cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1508	$(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1509
1510	a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1511	$(KBUILD_AFLAGS_KERNEL) \
1512	$(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1513	$(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1514
1515	quiet_cmd_as_o_S = AS $@
1516	cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1517
1518	# read all saved command lines
1519
1520	targets := $(wildcard $(sort $(targets)))
1521	cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1522
1523	ifneq ($(cmd_files),)
1524	$(cmd_files): ; # Do not try to update included dependency files
1525	include $(cmd_files)
1526	endif
1527
1528	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1529	# Usage:
1530	# $(Q)$(MAKE) $(clean)=dir
1531	clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1532
1533	endif # skip-makefile
1534
1535	PHONY += FORCE
1536	FORCE:
1537
1538	# Declare the contents of the .PHONY variable as phony. We keep that
1539	# information in a variable so we can use it in if_changed and friends.
1540	.PHONY: $(PHONY)
1541

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